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If you want to isolate the internet connection with fiber you can use an ethernet to fiber box.

Something as simple and cheap as this would do:

https://www.tp-link.com/us/business-networking/accessory/mc2...

+1 for the TP-link, I've got one running fiber to my AV equipment :)

It was a lot easier to run a pair of fiber-optic cables there than it would've been to do the same with cat6. Also I got to play around with fiber for the first time.

Never thought of isolating my modem from the rest of my gear though, I need to look into that.

Side effect of introducing less noise into AV equipment is a nice bonus!

You can never get perfect isolation from lightning (a direct hit will almost certainly take something out) but you can do worse than making sure you have an excellent grounding rod setup and a whole-home surge protector, which you monitor.

And then you can put surge equipment on any other incoming wires.

There are surge protectors that can protect the coax cables used for cable internet. Here's one that I use: https://www.amazon.com/Tripp-Lite-Right-Angle-Protection-TLP....